Jim Weir wrote in
:

As I recall, that flipflop triggers a timer (10 seconds???) that sends
the ident bit until timeout. Bose' book confirms what I remember
also.

That sounds likely. [Book? You have a book? G]

The main point, relative to this thread, is that it does NOT cause the
transponder to transmit anything in and of itself. It only controls what
gets sent upon interrogation.

jmk